City vs city
Chattanooga vs Powell, TN
Chattanooga currently scores 9 points higher overall than Powell, with the largest gap in flood.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Chattanooga: 46/100 · Powell: 37/100
Chattanooga is 9 points higher.
Flood
Chattanooga: 11/100 · Powell: 40/100
Powell is 29 points higher.
Chattanooga: FEMA NFHL flood zones: 4 features intersect this tile.
Powell: FEMA NFHL flood zones: 12 features intersect this tile.
Wind
Chattanooga: 14/100 · Powell: 13/100
Chattanooga is 1 points higher.
Chattanooga: Wind exposure derived from ingested design wind / climatology tiles.
Powell: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Chattanooga: 54/100 · Powell: 41/100
Chattanooga is 13 points higher.
Chattanooga: Lightning exposure derived from ingested climatology tiles.
Powell: Lightning exposure derived from ingested climatology tiles.
Tornado
Chattanooga: 42/100 · Powell: 23/100
Chattanooga is 19 points higher.
Chattanooga: Tornado risk derived from NOAA SPC historical reports.
Powell: Tornado risk derived from NOAA SPC historical reports.
Hail
Chattanooga: 100/100 · Powell: 72/100
Chattanooga is 28 points higher.
Chattanooga: Hail risk derived from NOAA SPC historical reports.
Powell: Hail risk derived from NOAA SPC historical reports.
Storm surge
Chattanooga: Unavailable · Powell: Unavailable
A score difference cannot be calculated without both sources.
Chattanooga: Storm surge model is not available for this location yet.
Powell: Storm surge model is not available for this location yet.
Wildfire
Chattanooga: 65/100 · Powell: 36/100
Chattanooga is 29 points higher.
Chattanooga: Wildfire exposure derived from ingested fire potential tiles.
Powell: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Chattanooga: 36/100 · Powell: 33/100
Chattanooga is 3 points higher.
Chattanooga: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Powell: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.